Method and apparatus for storing and dispensing effervescent beverages

ABSTRACT

Apparatus for storing and dispensing effervescent beverages such as sparkling or effervescent wines and beverages for human consumption and the method of handling same. The apparatus includes a container having a head member engaged by peripheral edge portions of a resilient and distensible bladder having a web portion in engagement with one surface of the head member until a gas under a selected super atmospheric pressure is forced between the head member and the resilient member to expand same to receive a selected liquid under a pressure to fill the space in the bladder and expel the gas through a valve. The liquid is maintained under super atmospheric pressure during storage by the bladder and also during dispensing of the contents, a glass at a time, by opening a dispensing valve or spigot.

Waited States ?atem n 1 Cranmer, Jr.

1 METHGD AND AP?ARATUS FOR STORING AND DISPENSING EFFERVESCENT BEVERAGES[76] Inventor: Roy A. Cramer, Jr., c/o Roycraft 1ndustries, 8100 Paseo,Kansas City, Mo.

[22] Filed: July 19, 1971 [21] Appl. No.: 163,885

[52] US. Cl. ..222/212, 220/85 B, 222/3865 [51] Int. Cl. ..B65d 37/00[58] Field of Search ...222/212, 386.5; 239/328, 330;

220/85 B, 85 TC 1 Mar.2'7,1973

Primary ExaminerM. Henson Wood, Jr. Assistant Examiner-Michael MarAttorney-Claude A. Fishburn et al.

57 ABSTRACT Apparatus for storing and dispensing effervescent beveragessuch as sparkling or effervescent wines and beverages for humanconsumption and the method of handling same. The apparatus includes acontainer having a head member engaged by peripheral edge portions of aresilient and distensible bladder having a web portion in engagementwith one surface of the head member until a gas under a selected superatmospheric pressure is forced between the head member and the resilientmember to expand same to receive a selected liquid under a pressure tofill the space in the bladder and expel the gas through a valve. Theliquid is maintained under super atmospheric pressure during storage bythe bladder and also during dispensing of the contents, a glass at atime, by opening a dispensing valve or spigot.

9 Claims, 6 Drawing Figures 2,609,118 9/1952 Cattaneo ..220/85B3,083,871 4/1963 Jepson 222/212X 3,158,296 11/1964 Cornelius ..220/85133,656,660 4/1972 Mueller ..222/212X 111 l l l 1 1'7 PATENTEUMARN m5SHEET 1 BF 2 [UL III" II.

/6 I NVENTOR.

ay A Cramer' d,-

METHOD AND APPARATUS FOR STORING AND DISPENSING EFFERVESCENT BEVERAGESThe present invention relates to storing and dispensing of effervescentbeverages and more particularly to a container anddispenser particularlyadapted for use with sparkling or effervescent wines and beverages forhuman consumption.

Consumption and enjoyment of sparkling wines has heretofore been subjectto quite a restrictive limitation, namely, that the sparkling wine mustbe kept bottled until the time of use and then all used in order toretain its sparkling quality, therefore, sales of sparkling wines by theglass in drinking establishments and restaurants have been substantiallycurtailed. Heretofore, in order to enjoy fresh sparkling wine, it wasnecessary to purchase it by the bottle, wherein the smallest availablesuch bottle was a so-called split or one twentieth of a gallon.

The present invention contemplates containing and dispensingeffervescent or sparkling beverages, such as wines and beveragescontaining gas, wherein the beverages are maintained under superatmospheric pressure during storing and dispensing thereof. Heretofore,the dispensing of effervescent or sparkling beverages and gas containingbeverages by the single glass was impractical because opening a bottleof effervescent beverage requiring breaking of a seal releases thepressure and this permits bubbles of gas within the beverage to escapeand even if the bottle is recapped, it is only a short period of timeuntil the taste of the beverage lacks quality.

The principal objects of the present invention are: to provide adispenser container and a method of storing and dispensing effervescentor sparkling wines and other beverages by the individual glass withoutthe risk that remaining wine in the container will turn flat or losequality within a short time; to provide such a container having apressurized distendable member for holding a quantity, such as a gallonor more of sparkling wines inert and which can be chilled and tapped toallow the sparkling wine or other effervescent beverage to flow evenlyand unimpeded to a dispensing device thereby delivering such beveragesin a desired quantity; to provide such a container and dispenser capableof withstanding pressures which are necessary to maintain the sparklingwines inert so as to retain freshness and sparkling quality; to providesuch a dispenser container having operating parts thereof effective toinsure a flow until complete evacuation of the container; to providesuch a dispenser container involving a novel technique or method offilling, storing, dispensing, pressurizing and cleaning; and to providesuch a method and a container which is sturdy in construction, positivein operation, durable in use, and particularly well adapted for theproposed use.

Other objects and advantages of this invention will become apparent fromthe following description taken in connection with the accompanyingdrawings wherein are set forth by way of illustration and example,certain embodiments of this invention.

The drawings constitute a part of this specification and include anexemplary embodiment illustrating various objects and features of theliquid or beverage container and dispenser of the present invention.

FIG. 1 is a side elevational view of a liquid container and dispenserembodying features of the present invention with portions broken away toillustrate component parts thereof and shown in an in-use position fordispensing a selected liquid therefrom.

FIG. 2 is a plan view of the liquid dispenser container in a positionfor filling with a gas and then with a selected liquid.

FIG. 3 is an enlarged longitudinal sectional view taken on line 33, FIG.2 and showing a resilient bladder in a collapsed or empty position priorto filling with the gas then liquid.

FIG. 4 is a longitudinal sectional view similar to FIG. 3 except showingthe resilient bladder being filled with the selectedliquid.

FIG. 5 is a longitudinal sectional view showing the bladder of theliquid container and dispenser in the inuse position.

FIG. 6 is an enlarged'fragmentary sectional view showing clamping meansfor mounting of the resilient bladder on head member and adjacent anopen end ofa shell member or housing to hermetically seal same together.

Referring more in detail to the drawings:

As required, detailed embodiments of the present invention are disclosedherein, however, it is to be understood that the disclosed embodimentsare merely exemplary of the invention which may be embodied in variousforms that are different from those illustrative embodiments presentedherein. Therefore, specific structural and functional details disclosedherein are not to be interpreted as limiting but merely as a basis forthe claims actually defining the scope of this invention. In thisregard, it is to be recognized that liquid dispenser containers, inaccordance herewith, may be embodied in various forms and, furthermore,that such containers may be variously supported and shaped, however, thedisclosure hereof is presented only as a representative basis forteaching one skilled in the art to variously employ the presentinvention in virtually any appropriate detailed structure.

ln the disclosed embodiment of the present invention, the referencenumeral 1 generally designates a liquid dispenser container particularlyadapted for use with champagne, cold duck, burgundy, and other sparklingor effervescent wines and beverages for human consumption. The liquiddispenser container 1 includes a head member 2 having peripheral edgeportions thereof engaged by peripheral edge portions of a distensibleresilient bladder 3 having a web portion 4 in engagement with onesurface 5 of the head member 2, said web portion preferably being inprestressed condition to assure said web portion normally contactingsaid surface 5. The bladder is removably mounted on the head member 2and when assembled is suitably sealed in a pressure tight relationwhereby when the bladder is distended a chamber 6 is defined by theinterior surface 7 of the bladder 3 and the surface 5 of the head member2. Liquid or gas may be introduced into the chamber 6 through a valvecontrolled filling 8 secured in a bore 9 through the head member 2preferably adjacent one side of the container. Gas under pressure mayescape from the chamber 6 through a vent l0 controlled by a pressurerelief valve 11 which is arranged to prevent any entry therethrough, tothe chamber 6 and is loaded to permit escape of gas under a selectedsuper atmospheric pressure.

The container 1 includes a shell member or housing 12 surrounding theresilient bladder 3 for protecting and confining same particularly whenin an expanded or distended position and to form a shipable container.The illustrated shell memeber 12 has an end wall 13 and a side wall 14extending from the end wall 13 and defining an open end adapted to besuitably secured to the head member 2. In the illustrated structure aflange 15 extends outwardly from the side wall 14 adjacent the open endof shell member 12 to provide a support for the head member 2 and theresilient bladder 3, as later described.

It is desirable that air within the shell member 12 be permitted toescape during distention or expansion of the resilient bladder 3, aslater described. One or more vent ports 16 are provided in the shell endwall 13 to prevent pressure on an exterior surface 17 of the resilientbladder 3 which would tend to resist the expansion thereof and vary theflow of the liquid from the container 1 due to variations in pressureson the exterior surface 17 of the resilient bladder 3. V

The head member 2 is mounted in the open end of the shell member 12 tothereby close and support same. The form of connection may be anysuitable structure to form a shipable container, however, the structurepreferably permits ready disassembly for cleaning. in the illustratedstructure, the head member 2 is a generally planar member havingperipheral edges thereof engageable by peripheral edge portions of theresilient bladder3. The one surface of the head member 2 may be flat orlevel, however, it is desirable to effect substantially complete removalof the beverage, therefore, the one surface 5 may be slightly convextoward the web portion 4 of the bladder 3.

in the structure illustrated, the head member 2 has a flange 18extending outwardly from a peripheral edge or edges 19 thereof to definea shoulder 20 facing the end wall 13 of the shell member or housing 12to be engaged by peripheral edge portions of the resilient bladder 3 toform a fluid tight seal therebetween.

The resilient bladder 3 has a rim portion 21 extending from theperiphery of the web portion 4 and defining an open end of the bladder 3to be engageable with the peripheral edge 19 of the head member 2. Areturn flange 22 extends outwardly from the rim portion 21 and has oneportion thereof engageable with the shoulder 20 defined by the flange 18of the head member 2 and an other portion defines a recess 23 adapted toreceive the flange extending outwardly from the side wall 14 of theshell member 12 for mounting the resilient bladder 3 and head member 2on the housing 12, as later described.

It is desirable to provide means engageable with the resilient bladder 3for mounting the peripheral edge portion thereof in hermetically sealingengagement with the peripheral edge of the head member 2 adjacent theopen end of the shell member or housing 12. in the illustratedstructure, a generally U or C-shaped band 24 is mounted on and extendsaround the periphery of the liquid dispenser container 1 to effecthermetically sealing engagement between the rim portion 21 of theresilient bladder 3 and the peripheral edge 19 of the head member 2. TheU or C-shaped band 24 has spaced arm portions 25 and 26 engageable withthe return flange 22 of the resilient bladder 3 and an exterior or endsurface 27 of the head member 2. A

tightening clamp 28 has end portions mounted on opposite ends of the Uor C-shaped band 24 whereby moving a handle 29 of a closed positioneffects tightening of the U or C-shaped band 24 about the shell memberor housing 12 adjacent the open end thereof and effects clampingengagement of the rim portion 21 of the resilient bladder 3 between theside wall 14 of the shell member or housing 12 and the peripheral edge19 of the head member 2.

The rim portion 21 of the bladder 3 is mounted on the peripheral edge 19of the head member 2 to define a distensible variable space continuallystressed to urge reduction of said space to substantially zero andmaintain super atmospheric pressure on contents of said space. Theflange 15 of the side wall 14 of the shell member 12 is mounted in therecess 23 in the return flange 22 and the band 24 is positioned with thearm positions 25 and 26 in engagement with the peripheral edge portionsof the bladder 3 and the head member 2 and the handle 29 of thetightening clamp 28 is adjusted to effect clamping engagement betweenthe peripheral edge portions of the bladder 3 and the head member 2. Theshell member 12 establishes selected limits for the distention of thebladder 3 and a desired volume of the beverage therein. Air within theshell member 12 is permitted to escape through the vent ports 16 duringthe distention of the bladder 3 to thereby prevent pressure on theexterior surface 17 thereof above the super atmospheric pressure on thebeverage within the bladder 3.

The bladder 3 is preformed and the web portion 4 of the resilientbladder 3 has a thickened portion 30 therein whereby the resilientbladder 3 is prestressed or stretched when the peripheral edge portionthereof and particularly the rim portion 21 of the bladder is inengagement with the peripheral edge 19 of the head member 2 whereby theweb portion 4 of the resilient bladder 3 is movable into engagement withthe one surface 5 of the head member 2 to thereby remove any space orchamber 6 between the resilient bladder 3 and the head member 2 to forcesubstantially all of the selected liquid from said space or chamber 6.

A selected gas, such as nitrogen, is communicated between the webportion 4 of the resilient bladder 3 and the one surface S of the headmember 2. The gas is under a selected pressure sufficient to distend orexpand the resilient bladder 3 toward the end wall 13 and side wall 14of the shell member or housing 12. In the illustrated structure, thevalve controlled fitting 8 includes a valve 31 preferably operative toselectively permit flowing of the gas or liquids through the head member2, as later described.

The valve 31 mounted on the head member 2 is operative for selectivelycommunicating a selected liquid, such as sparkling or effervescent winesand beverages for human consumption, into and from the chamber 6. Thevalve 11 is a one way gas escape valve or pressure relief valve havingoperating parts thereof adjusted to preventescape of the gas when thepressure is above the selected opening pressure. The valve 11 acts as acheck valve to prevent entry of air therethrough into the chamber 6.

The resilient bladder 3 should have a good memory and expand three ormore times the size of the web portion 4 when in engagement with'the onesurface 5. The.

resilient bladder 3 should also be inert to the selected beverage,therefore, a molded white rubber, injectionmolded butyrate, neoprene, orthe like is employed to provide a chemically inactive material whichimparts no taste to the wine or beverage. It is desirable that allfittings and valve surfaces contacted by the sparkling wine or beveragebe stainless steel or other corrosion resistant and chemically inert tothe beverage.

In using a container and dispenser, constructed as illustrated anddescribed, the component parts thereof are suitably sterilized and theshell member or housing 12 is supported on the end wall 13 with the headmember 2 above the end wall 13. It is preferred that all air beeliminated in the beverage receiving space and this is accomplished byintroducing a gas with the chamber 6. A suitable gas conduit, shown inbroken lines in FIG. 3, is connected to the valve 31 and and theselected gas, such as compressed nitrogen at a selected pressure isintroduced into the container 1 between the web portion 4 of theresilient bladder 3 and the one surface 5 of the head member 2 tothereby distend or expand the resilient bladder 3. The gas conduit isremoved and a suitable liquid conduit 32 is connected to the valve 31.The beverage is then introduced into the chamber 6 under pressure.During introduction of the selected beverage into the distended orexpanded resilient bladder 3, the gas therein is expelled outwardlythrough the escape valve 11 until the space or chamber 6 between the webportion 4 of the resilient bladder 3 and the one surface 5 of the headmember 2 is filled with the selected beverage. The liquid conduit 32 isremoved and the container 1 may then be stored or shipped to a place ofuse as said container 1 is of suitable strength and shape for shipping.When at a point of use the container 1 is inverted and then supported ona suitable pad 33. The dispenser container 1 and beverage therein ispreferably refrigerated to a temperature between twenty-four degreesFahrenheit and twenty-eight degrees Fahrenheit (24 F. to 28 F.) tothereby maintain the sparkling wine fresh and retain a high degree ofeffervescence. A spigot 34 is connected to the two way valve 31 and whena control 35 is adjusted to position the two-way valve 31 to permit adesired quantity of the beverage to flow through a flow line 36 and intoa suitable receptacle, such as a wine or champagne glass 37, theresilient bladder 3 retracts or collapses to urge the beverage throughthe two way valve 31 and the flow line 36. The bladder 3 is operative tomaintain a super atmospheric pressure on the beverage at all times.There is pressure on any beverage in the chamber 6 until it is empty.The web portion 4 of the resilient bladder 3 moves into engagement withthe one surface 5 of the head member 2 to thereby remove substantiallyall the selected beverage. The container and dispenser l is thensuitably sterilized by moving the handle 29 to an open position topermit removing of the U or C-shaped band 24 and thereby removal of thehead member 2 and resilient member 3 from the shell member or housing12. The resilient bladder 3 is removed from the head member 2 and allthe components are suitably cleaned and sterilized and re-assembled forreuse.

it is to be understood that while I have illustrated and described oneform of my invention, it is not to be limited to the specific form orarrangement of parts herein described and shown.

What I claim and desire to secure by Letters Patent A liquid dispensercontainer comprising:

.a distensible resilient bladder having an open end;

.a substantially rigid head member;

. means for securing the open end of said bladder on said head memberwith a fluid tight seal to define a variable chamber therebetween;

means for introducing a selected liquid between said bladder and headmember;

e. means for removing gas from the chamber between said bladder and headmember during introducing the selected liquid, said means for removinggas permitting flow in only one direction thereby preventing flowtherethrough into said bladder, said bladder retaining the selectedliquid under super atmospheric pressure and permitting selectivedispensing of same,

f. valve means operative for selectively drawing liquid from saidchamber which reduces in size in accordance with the volume withdrawn;

. means for introducing a gas under a selected pressure between saidbladder and said head member to distend said bladder.

A liquid dispenser container comprising:

a distensible resilient bladder having an open end;

a substantially rigid head member;

means for securing the open end of said bladder on said head member witha fluid tight seal to define a variable chamber therebetween;

. said head member being a generally planar member having one surface infacing relation with said bladder;

c. said bladder has a web portion in facing relation with the onesurface of said head member;

f. means for introducing a selected liquid between said bladder and headmember;

means for removing gas from the chamber between said bladder and headmember during introducing the selected liquid, said means for removinggas permitting flow in only one direction thereby preventing flowtherethrough into said bladder, said bladder retaining the selectedliquid under super atmospheric pressure and permitting selectivedispensing of same;

. valve means operative for selectively drawing liquid from said chamberwhich reduces in size in accordance with the volume withdrawn;

i. said bladder being pre-formed in size to have the web portion thereofnormally movable into engagement with the one surface of said headmember to remove the space therebetween and force substantially all theselected liquid from said space.

. A container as set forth in claim 2 including:

a. a shell member enclosing said bladder and defining a space into whichsaid bladder may be distended to thereby confine same when distended tocontain a desired volume of the selected liquid; and

. vent means in said shell member to permit escape of air from saidshell member during distention of said bladder to thereby preventpressure on an exterior surface thereof.

4. A container as set forth in claim 3 including means for introducing agas under a selected pressure between the web portion of said bladderand the one surface of said head member to distend said bladder.

. A container as set forth in claim 2 wherein:

. said one surface of the head member is convex toward the web portionof said bladder; and

. said web portion of said bladder has a thickened portion therein.

. A container as set forth in claim 2 wherein:

. said head member has peripheral edge portions engageable by saidbladder;

. said bladder has peripheral edge portions defining the open endthereof and engageable with the peripheral edge portions of said headmember; and

. said bladder is preformed and sized to have the web portions thereofstressed when the peripheral edge portions thereof are mounted on theperipheral edge portions of said head member whereby said web portion ofsaid bladder is in engagement with the one surface of said head memberexcept when distended.

. A container as set forth in claim 3 wherein said means for introducinga selected liquid between said bladder and said head member includesparts operative for the introducing a gas under a selected pressurebetween web portion of said bladder and the one surface of said headmember to distend said bladder.

. said means for securing the open end of said bladder on said headmember includes a clamp member extending around the periphery of thecontainer and having portions movable in to clamping engagement withsaid portions of said head member and the peripheral edge portions ofsaid bladder for effecting sealed engagement between portions of saidhead member and said bladder;

. said removable bladder and said head member being separable to effectdisassembly of the container to permit cleaning and sterilizing thecomponents thereof upon removal of said clamp means;

means for introducing a selected liquid between said bladder and headmember;

i. means for removing gas from the chamber between 9. beveragescomprising:

i valve means operative for selectively drawing liquid from said chamberwhich reduces in size in accordance with the volume withdrawn.

A method of storing and dispensing effervescent providing a distensiblevariable space continually stressed to urge reduction of said space tosubstantially zero;

. introducing a selected effervescent beverage into said space;

. retaining the beverage within said space and maintaining superatmospheric pressure on the beverage and absence of air in said spacewhile any beverage remains therein;

. selectively dispensing the beverage from said space withoutintroduction of air into the beverage within said space;

. introducing a gas under pressure into said space to distend same;

. confining said space within selected limits to establish a desiredvolume of the beverage; and

. permitting escape of air from the selected limits during distention ofsaid space to thereby prevent pressure on said space above the superatmospheric pressure on the beverage within said space.

1. A liquid dispenser container comprising: a. a distensible resilientbladder having an open end; b. a substantially rigid head member; c.means for securing the open end of said bladder on said head member witha fluid tight seal to define a variable chamber therebetween; d. meansfor introducing a selected liquid between said bladder and head member;e. means for removing gas from the chamber between said bladder and headmember during introducing the selected liquid, said means for removinggas permitting flow in only one direction thereby preventing flowtherethrough into said bladder, said bladder retaining the selectedliquid under super atmospheric pressure and permitting selectivedispensing of same, f. valve means operative for selectively drawingliquid from said chamber which reduces in size in accordance with thevolume withdrawn; g. means for introducing a gas under a selectedpressure between said bladder and said head member to distend saidbladder.
 2. A liquid dispenser container comprising: a. a distensibleresilient bladder having an open end; b. a substantially rigid headmember; c. means for securing the open end of said bladder on said headmember with a fluid tight seal to define a variable chambertherebetween; d. said head member being a generally planar member havingone surface in facing relation with said bladder; e. said bladder has aweb portion in facing relation with the one surface of said head member;f. means for introducing a selected liquid between said bladder and headmember; g. Means for removing gas from the chamber between said bladderand head member during introducing the selected liquid, said means forremoving gas permitting flow in only one direction thereby preventingflow therethrough into said bladder, said bladder retaining the selectedliquid under super atmospheric pressure and permitting selectivedispensing of same; h. valve means operative for selectively drawingliquid from said chamber which reduces in size in accordance with thevolume withdrawn; i. said bladder being pre-formed in size to have theweb portion thereof normally movable into engagement with the onesurface of said head member to remove the space therebetween and forcesubstantially all the selected liquid from said space.
 3. A container asset forth in claim 2 including: a. a shell member enclosing said bladderand defining a space into which said bladder may be distended to therebyconfine same when distended to contain a desired volume of the selectedliquid; and b. vent means in said shell member to permit escape of airfrom said shell member during distention of said bladder to therebyprevent pressure on an exterior surface thereof.
 4. A container as setforth in claim 3 including means for introducing a gas under a selectedpressure between the web portion of said bladder and the one surface ofsaid head member to distend said bladder.
 5. A container as set forth inclaim 2 wherein: a. said one surface of the head member is convex towardthe web portion of said bladder; and b. said web portion of said bladderhas a thickened portion therein.
 6. A container as set forth in claim 2wherein: a. said head member has peripheral edge portions engageable bysaid bladder; b. said bladder has peripheral edge portions defining theopen end thereof and engageable with the peripheral edge portions ofsaid head member; and c. said bladder is preformed and sized to have theweb portions thereof stressed when the peripheral edge portions thereofare mounted on the peripheral edge portions of said head member wherebysaid web portion of said bladder is in engagement with the one surfaceof said head member except when distended.
 7. A container as set forthin claim 3 wherein said means for introducing a selected liquid betweensaid bladder and said head member includes parts operative forintroducing a gas under a selected pressure between the web portion ofsaid bladder and the one surface of said head member to distend saidbladder.
 8. A liquid dispenser container comprising: a. a distensibleresilient bladder having an open end; b. a substantially rigid headmember; c. means for securing the open end of said bladder on said headmember with a fluid tight seal to define a variable chambertherebetween; d. said head member has peripheral edge portionsengageable by said bladder; e. said bladder has peripheral edge portionsdefining the open end thereof and engageable with portions of said headmember; f. said means for securing the open end of said bladder on saidhead member includes a clamp member extending around the periphery ofthe container and having portions movable in to clamping engagement withsaid portions of said head member and the peripheral edge portions ofsaid bladder for effecting sealed engagement between portions of saidhead member and said bladder; g. said removable bladder and said headmember being separable to effect disassembly of the container to permitcleaning and sterilizing the components thereof upon removal of saidclamp means; h. means for introducing a selected liquid between saidbladder and head member; i. means for removing gas from the chamberbetween said bladder and head member during introducing the selectedliquid, said means for removing gas permitting flow in only onedirection thereby preventing flow therethrough into said bladder, saidbladder retaining the selected liquid under super atmospheric pressureand permitting selectiVe dispensing of same; and j. valve meansoperative for selectively drawing liquid from said chamber which reducesin size in accordance with the volume withdrawn.
 9. A method of storingand dispensing effervescent beverages comprising: a. providing adistensible variable space continually stressed to urge reduction ofsaid space to substantially zero; b. introducing a selected effervescentbeverage into said space; c. retaining the beverage within said spaceand maintaining super atmospheric pressure on the beverage and absenceof air in said space while any beverage remains therein; d. selectivelydispensing the beverage from said space without introduction of air intothe beverage within said space; e. introducing a gas under pressure intosaid space to distend same; f. confining said space within selectedlimits to establish a desired volume of the beverage; and g. permittingescape of air from the selected limits during distention of said spaceto thereby prevent pressure on said space above the super atmosphericpressure on the beverage within said space.